| 高Tc氧化物超导体Bi(Pb)-Sr-Ca-Cu-O(F)的“不可逆线” |
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| 引用本文： | 曹效文,冯尚申,高孝恢,蒋淑芬,韦钦. 高Tc氧化物超导体Bi(Pb)-Sr-Ca-Cu-O(F)的“不可逆线”[J]. 物理学报, 1991, 40(1): 117-121 |
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| 作者姓名： | 曹效文 冯尚申 高孝恢 蒋淑芬 韦钦 |
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| 作者单位： | (1)中国科学院等离子体物理研究所,合肥,230031; (2)中南工业大学,长沙,410083 |
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| 基金项目： | 国家超导技术联合研究开发中心的资助;中国科学院超导办公室的资助 |
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| 摘 要： | 研究了高Tc氧化物超导体Bi(Pb)-Sr-Ca-Cu-O(F)体系的“不可逆线”。发现不可逆磁场H*<120Oe时,H*=1590(1—t)3/2;当120Oe*<1000Oe时,H*=35700(1—t)3/2-2480。指出H*(T)曲线是一个磁通格子熔化线,在曲线以下属于磁通蠕动区;在H*(T)与Hc2(T)之间属于磁通格子液态区,即磁通流动区。关键词：
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| 关 键 词： | 高Tc氧化物 超导体 不可逆线 |
| 收稿时间： | 1990-04-09 |
THE "IRREVERSIBILITY LINE" OF FLUORINE-DOPING Bi1.7Pb0.3Sr2Ca2Cu3Oy BULK SUPERCONDUCTOR |
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| CAO XIAO-WEN,FENG SHANG-SHEN,GAO XIAO-HUI,JIANG SHU-FEN and WEI QIN. THE "IRREVERSIBILITY LINE" OF FLUORINE-DOPING Bi1.7Pb0.3Sr2Ca2Cu3Oy BULK SUPERCONDUCTOR[J]. Acta Physica Sinica, 1991, 40(1): 117-121 |
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| Authors: | CAO XIAO-WEN FENG SHANG-SHEN GAO XIAO-HUI JIANG SHU-FEN WEI QIN |
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| Abstract: | The "irreversibility line" of high Tc fluorine-doping Bi(Pb)SrCaCuO(F) bulk superconductor has been studied experimentally. It is shown that there are different H*∝(l-t)3/2 relations in various regions of magnetic fields, namely, H*=1590(1-t)3/2 in the field region below 120 Oe and H*= 35700(1-t)3/2 -2480 in the region above 120 Oe. We think that the irreversibility lines in low field and in high field represent the behaviour of weak link and the grain superconductivity respectively. We note that H*(T) is substantially a melting line of the flux lattice. It is in the vortex lattice state below the "irreversibility line" H*(T) and in the vortex liquid state between H*(T) and H(c2) (T) curves. |
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